Wrong Ledger showing on supplier form

 Hi,
Customer has created two ledgers like A & B. A is original ledger and B is testing ledger. While, customer trying to create or query the supplier system default showing "B" ledger. Everytime manually we are selecting "A" ledger in the lov, i'm uploading the screen shot document also. we verified the profile options and setups are proper. Where we've to restrict the ledger "B" to get default on the supplier form. We required "A" should be default on the supplier form.

Regards
Avaneesh